I think I just find it hard to adapt to change. When she popped up in HGSS it was just "Ooh, what a pleasant surprise!" but now that I'm so used to seeing Cynthia all over the shop, I'm more like "OH MY GOD WHAT IF SHE'S NOT INCLUDED IN XY?!?!". If she's not involved in Gen VI I assume I'll get over it, and she probably will eventually wear out her welcome (even for me) if she continues to appear, but it is nice to see her pop up (for now at least).